lesson 6 Flashcards
What are viruses?
tiny organic forms between living cells and organic compounds
Viruses are smaller than bacteria - true or false
true
Which microscope/magnification must be used to see viruses?
- electron microscope
- 1000000 x
True or false - viruses can reproduce in the food
false
What can viruses cause?
- influenza
- mumps
- measles
- smallpox
- cold
- poliomyelitis
- encephalitis
How do viruses multiply?
They use our cells to duplicate themselves
2 most common types of viruses in food industry
- Hepatitis A (liver)
- Noroviruses
What are parasites?
Organisms that live in or on other organisms without benefiting the host
2 most common parasites in food industry
- Anisakid worm (fish) -> anisakiasis
- trichinella spiralis (pork)
How to prevent anisakiasis
-freeze fish for 15 hours at -31 F
What is yeast?
- one celled organism
- bigger than bacteria
What does yeast require for proper growth?
- warmth
- moisture
- food
- air
What is the result of yeast acting on sugar?
- carbon dioxide
- alcohol
Why is the production of alcohol used by yeast limited to 18%?
yeast killed at this concentration of alcohol
What is the process called by which yeast reproduces?
budding
Is yeast harmful
generally not but may cause skin infections
What can be the result of wild yeast?
cause food spoilage (undesirable)
Order of size of the 4 microorganisms
- virus
- bacteria
- yeast
- mold
What are molds?
multicellular microscopic plants
only visible when in colonies in sufficient quantity
Name 2 diseases caused by molds
- ringworm
- athletes foot
True or false - moldy foods usually cause illnesses
false
